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Editorial Team
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Asked: 2026-05-27T07:25:32+00:00

This may seem to be a duplicate question for Is KillTimer necessary? , but

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This may seem to be a duplicate question for Is KillTimer necessary?, but i would like to confirm this with credible source.

Does destroying window really free the resource allocated by the OS for the timer? (does DestroyWindowsTimers really get called let alone if such function actually exists? if so, where?)

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  1. Editorial Team

    No, it is not necessary. From the documentation of DestroyWindow (with emphasis added):

    The function sends WM_DESTROY and WM_NCDESTROY messages to the window to deactivate it and remove the keyboard focus from it. The function also destroys the window’s menu, flushes the thread message queue, destroys timers, removes clipboard ownership, and breaks the clipboard viewer chain (if the window is at the top of the viewer chain).

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